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'Why should you take the time to make your site more accessible? In addition to the service you’ll be doing for the visually-impaired community, accessible sites are more easily crawled, which is a first step in your site’s ability to appear in search results.'

'Not all users may have JavaScript enabled in their browsers. In addition, technologies such as Flash and ActiveX may not render well (or at all) in every browser. We recommend following our guidelines for using Flash and other rich media, and testing your site in a text-only browser such as Lynx. As a bonus, providing text-only alternatives to rich-media content and functionality will make it easier for search engines to crawl and index your site, and also make your site more accessible to users who use alternative technologies such as screenreaders.'

Browser compatibility Google Webmasters/Site Owners Help Pages

Contenus non-textuels: images

'Use the alt attribute to provide descriptive text. In addition, we recommend using a human-readable caption and descriptive text around the image.'

Hidden text and links Google Webmasters/Site Owners Help Pages

Contenus non-textuels : JavaScript

'Place the same content from the Javascript in a no script tag. If you use this method, ensure the contents are exactly same as what is contained in the Javascript and that this content is shown to visitors who do not have Javascript enabled in their browser.'

Hidden text and links Google Webmasters/Site Owners Help Pages

Contenus non-textuels : vidéos

'Include descriptive text about the video in HTML. You might also consider providing transcripts.'

Hidden text and links Google Webmasters/Site Owners Help Pages

Dépendance à JavaScript

'When you’re designing your AJAX site, think about the needs of your users, including those who may not be using a JavaScript-capable browser (for example, people who use screen readers or mobile devices). One of the easiest ways to test your site’s accessibility is to preview it in your browser with JavaScript turned off, or to view it in a text-only browser such as Lynx. Viewing a site as text-only can also help you identify other content which may be hard for Googlebot to see.'

AJAX Google Webmasters/Site Owners Help Pages

L'utilisation des iFrames

'Avoid iFrames – or link to their content separately.'

AJAX Google Webmasters/Site Owners Help Pages

Amélioration progressive

'If you’re starting from scratch, a good approach is to build your site’s structure and navigation using only HTML. Then, once you have the site’s pages, links, and content in place, you can spice up the appearance and interface with AJAX. Googlebot will be happy looking at the HTML, while users with modern browsers can enjoy your AJAX bonuses. When creating your links, format them so they’ll offer a static link as well as calling a JavaScript function. That way you’ll have the AJAX functionality for JavaScript users, while non-JavaScript users can ignore the script and follow the link... using HTML links remains a strong way to help us (as well as other search engines, mobile devices and users) better understand your site’s structure.'